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Finding the Third Proportional to 19,858.50 and 39,213

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Solution

The third proportional to 19,858.50 and 39,213 is: 77,430.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,858.50 : 39,213 = 39,213 : x
  2. Step 2: Convert to fraction form
    19,858.50/39,213 = 39,213/x
  3. Step 3: Cross multiply
    19,858.50x = 39,213 × 39,213
  4. Step 4: Simplify right side
    19,858.50x = 1,537,659,369
  5. Step 5: Solve for x
    x = 1,537,659,369/19,858.50
  6. Step 6: Final answer
    x = 77,430.79

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Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.